Door lock



A. N. CANDlA May 28, 1957 DOOR LOCK 2 Sheets-Sheet 1 Filed Nov. zo, 195o INVENTOR ANGEL NAVARRETE CAND/A ATTORNEY May 28, 1957 A. N. cANDlA 2,793,520

DOOR LOCK Filed Nov. so, 195o 2 smeg-sheet 2 c/7' INVENTOR T=ln NGL NAVA/RETE CANDY/4 BY l? ATTORNEY United States Patent() DOOR LOCK Angel Navarrete Candia, Santiago, Chile Application November 30, 1950, Serial No. 198,319 Claims priority, application Spain November 30, 1949 s claims. (ci. 7o14s This invention relates to improvements in locks.

'Conventional locks are commonly provided with a dead bolt actuated by a key and a latch bolt or spring` bolt operated independently by a knob visible from the outside of the lock.

An object of the invention is to provide a lock which 'gives increased security. Another object is to provide, in such a lock, a bolt which acts both as a latch bolt and as a hasp to receive a dead bolt.

A further object is to provide, in connection with such locks, electrical means for indicating any operation of or tampering with the lock. t

Another object is to provide a lock including means for fastening the bolt in its locked position.

A further object is to provide a `lock whose casing escutcheon plate are constructed for `installation so that the mounting screws are not visible.

Other objects and advantages of the present invention will appear from a consideration of the following specification and the accompanying drawings, in which Fig. 1 is a cross sectional view showing one embodiment of the invention with certain parts broken away and others omitted for the sake of clarity.

Fig. 2 is a cross sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a-detail sectional view taken on the line l3-3 of Fig. l, looking in the direction of the arrows.

Fig. 4 is a sectional view taken on the line 4 4 of Fig. 2.

Fig. 5 is a sectional View of the inside lock operating knob in the mechanism of Fig. l.

Fig. 6 is an elevational view of the` inside lock operating mechanism.

Fig. 7 is a view similar to Fig. 2 but with certain parts omitted and illustrating the manual unlatching mechamsm.

Fig. 8 is a diagrammatic sectional view of a modified form of cylinder lock which may be used in connection with the invention.

Fig. 9 is a wiring diagram of an alarm circuit which may be used in connection with a lock equipped with the cylinder of Fig. 8.

Fig. 10 is a cross sectional view of an escutcheon plate construction which may be used with any of the cylinder locks illustrated.

Fig. 1l is a fragmentary cross sectional view taken on the line 11--11 of Fig. 2 looking in the directiontof the arrows.

`Referring to the drawings, there is shown a casing 1` connected at one end by a `hinge 2 to a base plate 3 attached to a door 4 by means of screws 5. The shape of casing 1 is such that it completely coversthe base plate 3, concealing the screws 5 when it is in place. The end of the casing 1 nearest the open edge of the door is provided with a flange 6 attached to the door by means of screws 7. It may be seen that the screws 7 are also concealed when the door is closed.

and`

2,793,520 Patented May 28, 1957 Inside the casing 1 is mounted a bolt 8 having a central recess 8a and the locking end thereof divided into three parallel projections 8b, 8c and 8d. The outer ends of these projections are smoothly curved so that the bolt may act as a latch bolt. The open back of casing 1 is closed by a cover plate 1a, attached to the casing 1 by means of projecting lugs 1b at its right end which are received in the flange 6, and by screws 1c at its left end. A number of balls 9 are provided within the casing 1 above and below the bolt 8 to facilitate its movement therein.

The central projection 8c is provided with an aperture 8e for receiving a plunger or dead bolt 10. The plunger 10 is operated by a lock cylinder 11 provided with a key operated screw 12 having a high pitch. The plunger 10 is hollow to receive the end of the screw 12 and is provided with a pair of teeth 10a (see Fig, 3), which cooperate with the threads on the screw 12 so that the plunger 10 may be advanced and retracted by rotation of a key inserted in the lock cylinder lll.

A pair of pins 13 are slidably mounted in suitable apertures in the bolt 8 and extend through aligned apertures in lugs 14 xed to the bottom of the recess 8a; Between the lugs 14, the pins 13 are each provided with anges 15. Biasing springs 16 are retained between the flanges 15 and right hand lugs 14. These springs are effective to bias the bolt 8 from its unlatching to latching position. t As shown in Fig. 2, when the bolt 8 is in locking position, the pins 13 are no longer in contact with the casing Wall and thus have no effect at this position. The pins contact the casing wall at the latching position t so thatthe springs are only elective between the latching and unlatching position of the bolt.

The bolt 8 may be operated by either of two keyactuated mechanism which will now be described.

Referring to Fig. 1, there is shown a cylinder lock of conventional construction including a body 17 and a cylinder 18 rotatable therein by means of a key. When a key is inserted in the cylinder 18 it extends through a key slot 20 in that cylinder into a cooperating key slot 21 formed in an operating piece generally indicated at 22. The piece 22 is rotatable independently of cylinder 18 except when a key is extended into slot 21. The piece 22 may be held in any angular position to which it is turned by the key by means of one or more spring biased balls 19 engaging a suitably notched surface on the periphery of the piece 22. The piece 22 has a non-circular recess 22a in the face directed away from the cylinder 18. This recess is adapted to receive a mating non-circular projection 23a on a shaft 23 which comprises a pair of spaced heads 23b and 23C connected by a pair of diametrically spaced pins 23d. The end of head 23b is rotatably mounted within an aperture in the backplate 1a. The end of head 23C is journaled in a lock body 24 attached to the casing 1. The lock body 24 is apertured to receive a conventional cylinder lock 25 aligned with the head 23e. A key may be inserted through slots in the cylinder 25 and the head 23e to rotate the shaft 23. The shaft 23 may therefore be rotated by means of suitable keys from either side of the door.

The pins 23d are received between the teeth of a rack 26 formed in the bolt 8 and projecting into an opening 27 in the bolt. The rack 26 is substantially equal in length to the distance between the locking and latching positions of the bolt. When shaft 23 is rotated counterclockwise as viewed in Fig. 2, the pins 23d act as a pinion, driving the rack 26 to the left and withdrawing the bolt 8 toward its unlockedposition. When the right end of rack 26 passes beyond the pins, the bolt 8 is unlocked, but is still in latching engagement with the hasp 35. This position is hereinafter termed the latching position of the bolt8. The bolt may be moved further to the left vto unlatch it from 3 the hasp 35, by further rotating the shaft 23 counterclockwise by either key, whereupon a finger 23e formed on the head 23C engages a lug 3l and pushes the bolt 8 to its unlatched position.

There is shown in Fig. 4 an accessory which may be used to immobolize the bolt in either its locked or its unlocked position. This mechanism includes a plunger 32 slidable in a body 32a suitably mounted on the casing 1 and movable between a retracted position shown' in full lines and an actuated position shown in dotted lines. When in its actuated position, the bolt 32 cooperates with either of a pair of stops 33 carried by the bolt 8. A spring biased ball 34 cooperates with a pair of` grooves formed in the surface of the plunger 32 to hold it in either of its positions.

Mechanism is also provided for operating the bolt 8 from its latching position to its unlatched position from -the inside of the door without the aid of a key. This mechanism includes a knurled ring 37 rotatably mounted on the body 24. Ring 37 carries a pin 40 (Figs. 5-7) which projects inwardly through an arcuate slot 43 formed in the casing 1, and between the tines formed on the lower end of a fork 41 which is pivoted at its upper' end on the inner side of the casing. The lower end of fork 41 cooperates with a iiange 42 projecting from the ybolt 8. Flange 42 is integral with the lug 31, but does not project as far from the bolt 8 (see Fig. ll).

When the bolt 8 is in its latching position and the ring 37 and pin 40 are rotated counterclockwise as viewed in Fig. 7, the lower end of fork 41 engages the end of flange 42 and drives the bolt 8 to its unlatched position. The opening 27 is suiciently long to permit this movement without interference with the pinion pins 23d.

When the bolt v8l is moved from its latching position towards its locking position, the end of fork 41 rides on the upper surface of the flange 42, whose length is substantially the same as the distance between the locking and latching positions of 'the bolt. Under such conditions, the ring 37 cannot operate the fork 41 so as to move the bolt 8.

There is shown in Fig. 8 a sectional view of a modified form of lock cylinder 44 provided with a key operated switch actuator 45 for operating a switch 46. When a key is inserted in `the lock it pushes the actuator 45 to the right to close the switch 46. The circuit controlled by switch 46 is shown in Fig. 9 and extends from any suitable source of electrical energy through the switch 46 to an alarm indicated at 47. The alarm may be either audible, visual or of any other suitable type.

Fig. l shows an escutcheon plate arrangement which may be used with any of the cylinder locks described above. This arrangement includes a hidden cylindrical member 48 with an inwardly disposed flange 52 which tends to close one end of the cylinder and which is apertured at the center to receive the body 17 of the lock. Telescoped within the hidden member 48 is a fully exposed cylindrical member 51 fully open at both ends and with an outwardly extending flange 49 adapted for attachment to a wall or door by means of screws 50.

What is claimed is:

1. A lock comprising a bolt movable between an extreme locking position, an intermediate latching posi- 'tion and an extreme unlatching position, means biasing the bolt only from said unlatching to said latching positions, a rack connected to the bolt for movement therewith Vhaving a length substantially equal to the distance between said locking and latching positions of said bolt, said rack being in longitudinal alignment with the movable axis of said bolt, said bolt having an elongated aperture aligned with but extending beyond said rack at one end and having a length substantially equal to the distance between said locking `and unlatching positions of said bolt, a pinion mounted transversely of said rack, bolt and aperture and adapted to drivingly engage said rack between said locking and latching positions and pass freely within said aperture between said latching and unlatching positions, key actuated means connected to said pinion for rotation thereof, a radially extending linger attached to the pinion for concurrent rotation therewith in a plane parallel to and spaced from said bolt and rack, a lug projecting ltransversely from said bolt in a position to be engaged by said nger upon rotation of said pinion after the bolt reaches said latching position, said finger and lug being effective upon further rotation of the pinion to drive the bolt to said unlatching position.

2. A lock comprising a bolt movable between 'an extreme locking position, an intermediate latching position and an extreme unlatching position, means biasing the bolt only from said unlatching to said latching positions, a rack connected to the bolt for movement therewith having a length substantially equal to the distance between said locking and latching positions of said bolt, `said rack being in longitudinal alignment with the movable axis of said bolt, said bolt havng an elongated aperture aligned with but extending beyond said rack at one end and having a length substantially equal yto the distance between said locking and unlatching positions of said bolt, a pinion mounted transversely of said rack, 'bolt :and aperture and adapted to drivingly engage said rack between said locking and latching positions and pass freely within said aperture between said latching and unlatching positions, key actuatedmeans connected to said pinion for rotation thereof, a casing enclosing said bolt, and means independent of said rack and pinion for driving said bolt from said latching to said unlatching positions comprising a knob rotatably mounted on the outside of said casing, a pin on said knob projecting through an arcuate slot in said casing into the interior thereof, a pivoted linger inside said easing having a forked end into which said finger projects, so that said finger is angularly movable by rotation of said knob, and a flange on said bolt extending longitudinally with the movable axis thereof for va distance substantially equal to the distance between said locking and latching positions of said bolt and projecting transversely of said bolt into the path of said finger, said linger being carried on top of said ange in an ineffective position when said bolt is moving between said locking and latching positions, said finger engaging the end of said ange at said latching position and driving said bolt to said unlatching position through rotation of said knob.

3. A lock comprising a bolt movable between an extreme locking position, an intermediate Ilatching position and an extreme unlatching position, means biasing the bolt only from said unlatching to said latching positions, a rack connected to the bolt for movement therewith having a length .substantially equal to the distance between said locking and latching positions of said bolt, said rack being in longitudinal alignment with the movable axis of said bolt, said bolt having an elongated aperture aligned with but extending beyond said rack at one end and having a 'length substantially equal to the distance between said locking and unlatching positions of said bolt, a pinion mounted transversely of .said rack, bolt and aperture and ladapted to drivingly engage said rack between said locking and latching positions and pass freely within said aperture between said latchingand unlatching positions, key actuated means connected to said pinion for rotation thereof, and means independent of said rack operable to move said bolt from said latching to ysaid unlatching positions against said biasing means.

ReferencesCited in the file of this patent UNITED STATES PATENTS 166,034 Shepardson July 27, 1875 583,905 Hillhouse et al. June 8, 1897 1,304,105 Segal'(2) May 20, i919 (Other references on following page) Shimocuskies Nov. 16, 1920 Sarbij May 17, 1921 Schonwald Mar. 7, 1922 Freysinger Jan. 1, 1924 Levine Oct. 28, 1924 Segal Feb. 24, 1925 Hill et al Oct. 13, 1925 Blount Oct. 20, 1925 6 Russo Q 12 Aug. 16, 1927 Falk July 14, 1931 Golokow et al. Oct. 13, 1936 Ledin Aug. 31, 1937 Larson Aug. 25, 1942 FOREIGN PATENTS Germany Nov. 6, 1923 France Feb. 5, 1932 

